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121, Basking in the glow of the bright supergiant star Rigel, the Witch Head Nebula trails like a puff of smoke through the Eridanus constellation about 700 light years away.

122, The smaller yellowish nebula (NGC 6729) surrounds young variable star R Coronae Australis.

123, Explanation: The sands of time are running out for the central star of this hourglass-shaped planetary nebula.

124, The Double Helix Nebula is a gaseous nebula near the center of our galaxy.

125, Still, no known cat could have created the vast Cat's Paw Nebula visible in Scorpius.

126, Unspeakable beauty and unimaginable bedlam can be found together in the Trifid Nebula .

127, And Chandra made a picture very recently of the Crab Nebula, of the pulsar, and that's what I want to show you now.

128, They tower above the surface of a molecular cloud on the edge of the nebula.

129, A digital view of the stellar nurseries of the Orion Nebula.

130, As for the spiral itself, current supposition is that this is the result of a star in a binary star system entering the planetary nebula phase, when its outer atmosphere is ejected.

131, The Crab Nebula, the result of a supernova seen in 1054 AD, is filled with mysterious filaments.

132, While the planetary nebula phase is thought to last for around 10, 000 years, astronomers estimate the age of the outer filamentary portions of this halo to be 50, 000 to 90, 000 years.

133, This computer processed image shows the Crab Nebula pulsar (below and right of center) and the Geminga pulsar (above and left of center) in the "light" of gamma-rays.

134, A nebula is really a discrete mass of innumerous stars.

135, Toward the bottom of the image, stars are still forming in the associated emission nebula NGC 6357, including several that appear to be breaking out and illuminating a spectacular cocoon.

136, Some nebulae are made up of both reflection and emission components such as the Trifid Nebula.

137, The results showed that radiation from the Crab Nebula saw a steady decline totaling 7% over the past two years at four high-energy X-ray bands (in the range of 12, 000 to 500, 000 electron-volts).

138, One of the fainter objects in Messier 's catalog, the Owl Nebula is a planetary nebula, the glowing gaseous envelope shed by a dying sun-like star as it runs out of nuclear fuel.

139, During his sophomore year, he sold his first science - fiction story to a Scottish magazine named Nebula.

139, Sentencedict.com try its best to gather and make good sentences.

140, The star cluster is embedded in a nebula , which spans some 110 light - years .

141, The blue glow that surrounds the Blue Horsehead's eye -- and other stars around the image -- is a reflection nebula composed of fine dust.

142, Located in the Large Magellanic Cloud, a small satellite galaxy orbiting our Milky Way galaxy, the region's spidery appearance is responsible for its popular name, the Tarantula nebula.

143, Like its cousin in astrophysical waters the Crab Nebula supernova remnant, IC 443 is known to harbor a neutron star, the remnant of the collapsed stellar core.

144, The prominent red knot on the left is 30 Doradus, or the Tarantula Nebula, a giant star -forming region in the Large Magellanic Cloud.

145, We have identified the Crab Nebula as the debris of this explosion.

146, Located 5, 800 light-years from Earth in the Centaurus constellation, this nebula is a stellar nursery of new star clusters born from a cloud 8 million years ago.

147, I called my radio astronomy friends yesterday and I asked them, "What is the rotation period of the neutron star in the Crab Nebula?"

148, On the left is M97 in the constellation Ursa Major, also known in the northern hemisphere as the Owl Nebula.